Compressed-air starting arrangement for internal-combustion engines



El COMPRESSED MR STARTING ARRANGEMENT FOR INTERNAL COMBUSTION ENGINES.

' I APPLICATION FILED DEC-3, I920. 1,413,583.

Patented Apr. 25, 1922.

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nrmsr nnnxnor KIEL-I-IASSEE, ennariinr, ASSIGNOR ro Fern-n. Kraut? AKTIEN- eEsELLscrrArr enarramriwgnnrr, or KIEL-GAARDE1\T,- GERMANY.

COMPRESSED-AIR STARTING ARRANGEMENT FOR:INTERNAIFCOMBUSTION ENGINES.

Application filed December 3, 1920. Serial No. 428,125.

To all whom it may cancer-aw Be it known that I ERNsT HnRKT, r'esid- Engines, of whichthe following is a specification. t i

The object of this invention is a compressed air starting arrangement for internal combustion engines and the like, the con trol apparatus of which, moving the com-- pressed air starting valve, is automatically thrown intov and out of gear on admitting and cutting off the compressed air. I t

From known arrangements of this kind,

I with which, on turning on the compressed air, a prolongation of theconnecting rods takes place, throwing them into gear, and with which the compressed air cylinder causing the prolongation of the connecting rods forms so to say 'an elastic connection link inserted between two parts of the connecting means, the object of this invention differs in so far that, on. turning on the starting compressed air, neither-a change in the position nor a change in -the'length of the connecting rods takes place, this being prevented by the cam disk of the control device. Only at a determined position of the cam disk (starting position) this block ing is released and thus the pressure means has the possibility to increase its volume and thus to cause the opening of the starting valve. As, according to the invention, the length of the connecting rods remains permanently constant, the disadvantages of the first named known control device combined with theprolongation of the connecting rods and the insertion of an elastic member into the chain of rods, are avoided and a more precise working of the control device is obtained. Besides, the control device is exceedingly simplified by the almost total absence of connecting rods. 7

On thedrawing one embodiment of the object of the invention is shown in section.

A is the part in question of the cylinder head of an internal combustion engine provided with the valve box B of the compressed air starting valve, and the compressed air feeding conduit a In the upper part of the boring of the box B a piston O capable of a movement up and down Specification of Letters Patent.

Patented Apr. 25, 1922.

is arranged concentrically around the valve rod When at rest, the piston. O bears with its lower surface against the bifurcated end of the arm k of the valve lever H. The

starting valve (Z opening towards the interior of the working cylinder. is in its'rest position held closed by the-spring E provided in, the lower part of the valve box.-

This spring presses from below against a collar d of the valve rod. and presses this collaragainst the lower surface ofthe bifurcated end of the valve. lever arm h The valve rod has a'boring 0Z through which the starting compressed air can enter the, room above the piston O. The valve lever H oscillating around the valve leverv shaft G carries on its rlght arm the starting roll 71. working together with the cam disk K k whilst its left arm h v embraces with play the valve rod D between the and the collar d The-described starting arrangement works as follows:

piston O When at rest orn-in normal working con-- dition, the different members of. the starting apparatus occupythe position shown in the drawing. The piston O presses by its weight on the arm 7 ofthe valve lever and on the collar d of the rod D. Against this pressure the valve plate d 'is pressed upward by the spring E onits seat, consequently the valve held closed. The pressing of the start ing roll 72,2 against the cam disk K by the pressure ofv the piston O'o'n the arm A of the valve lever is partly neutralized by a spring N. When for the purpose of starting 1 or reversing compressed air is admitted into the'conduit a the piston Otends to move downwards and thus the starting roll [t is pressed firmer against its running surface on the cam disk K. Areal downward movement or the piston O can, however, not take place, as the valve lever H is prevented by the roll 71, from turning around the valve lever shaft G. Only after the cam disk K has turned so far under the action of the other cylinders of the engine that its cavity 70 (negative cam face) passes under the roll 72?, the piston O can move downwards, press down the valve rod by means of the collar 03? and open the starting valve (P, so that the compressed air can flow into the cylinder. On the going down of thetvalve rod the spring E is compressed; as soon as the cavity 70 of the cam disk K has passed under the roll h The valve is closed again bythe spring E, and the piston C pressed back into its initial position by the arm ]L-1 of the valve lever H. This working order repeats itself aslong as the feeding of the compressed air lasts, that is till the engineis reversed to combustion running. As soon as the pressure in the working cylinder surpasses the pressure of the starting compressed air the starting valve is auto1natically closed in consequence of the difference in pressure.

Claims. p

1. A compressed air starting device for internal combustion engines comprising port formed in the head of the cnginefor the admittance of compressed air, a valve for closing said'port, a valve stem, a piston on said'val ve stem, a chamber in which said piston. works, a valve lever operatively engaging said valve stem, a cam disc for controlling said' valvelever and means acting upon said piston for opening said valveupon rotation of said earn disc. Y r 2; A compressed air starting arrangement for internal combustion engines provided with a control apparatus, said control apparatus comprising a valve for controlling the admittance of compressed air, a valve rod.

provided with a piston, a chamber in which said piston operates, means for admitting air to one side'o-i' said piston, thereby tending to open said valve, 21. valve lever in engagement with said valve stem and a cam disc for controlling said valve lever, whereby said lever may be released to permit the pressure on said piston to open said valve.

3. A starting arrangement for internal combustion engines comprising a control device for controlling the admittance of compressed air thereto, said control device embodying a valve, compressed air meansnor- -mally tending to open said valve,.a doublearmed valve lever engaging said means and retaining said valve in its closed position, a cam disc engaging one end of said valve lever-,whereby when said cam disc is rotated to a pre-determined position said valve lever will be released to permit said valve toopen. 1 7 I 4;. A compressed air starting device for internal combustion engines comprising a valve for controlling the admittance of air to the engine cylinder, a valve stem for said valve, a piston secured to said valve stem, a chamber in which said piston works, means for supplying air to the upper side of'said piston, whereby pressure may be accumulat'ed tending to open said valve, a valve lever pivotally supported adjacent said valve ste1n,said valve lever having a bifurcated, end

which engages said valve stem beneath said piston, a spring surrounding said valve stem tending to seat said valve, a cam disc, the other end of said valve lever engaging said cam disc, said valve lever tending to prevent the opening of said valve, said valve lever permitting the openingof said valve when said cam disc has rotated to a predetermined position.

The foregoing specification signed at Kiel, Germany, this 29th day of June, 1920'. V a E. HERKTL In presence of I R. SELLHORN, F. PtnJIMA'r. 

